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High-order solar migrating tides quench at SSW onsets
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  • Maosheng He,
  • Jeffrey M Forbes,
  • Jorge L. Chau,
  • Guozhu Li,
  • Weixing Wan,
  • Dmitry V. Korotyshkin
Maosheng He
Leibniz-Institute of Atmospheric Physics at the Rostock University

Corresponding Author:he@iap-kborn.de

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Jeffrey M Forbes
University of Colorado Boulder
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Jorge L. Chau
Leibniz-Institute of Atmospheric Physics at the Rostock University
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Guozhu Li
Institute of Geology and Geophysics, Chinese Academy of Sciences
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Weixing Wan
Institute of Geology and Geophysics,Chinese Academy of Sciences
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Dmitry V. Korotyshkin
Kazan Federal University
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Sudden stratospheric warming events (SSWs) are the most spectacular atmospheric vertical coupling processes, well-known for being associated with diverse wave activities in the upper atmosphere and ionosphere. The first four solar tidal harmonics have been reported as being engaged. Here, combining mesospheric winds detected by three mid-latitude radars, we demonstrate at least the first six harmonics occur during SSW 2018. Wavenumber diagnosis demonstrates that all six harmonics are dominated by migrating components. Wavelet analyses reveal that the 4th, 5th, and 6th harmonics quench after the SSW onset. The six harmonics and the quenching appear also in a statistical analysis based on near-12-year observations from one of the radars. We attribute the quenching to reversal of the background eastward wind.
28 Mar 2020Published in Geophysical Research Letters volume 47 issue 6. 10.1029/2019GL086778